1
6
Start-up
•
Disconnect the motor from the mains.
•
Remove the priming plug on the top of the pump body.
•
Pour liquid through the delivery pipe until it overflows through the priming hole.
•
While priming, rotate the pump shaft by hand to break any sticking.
•
Replace the priming plug in its position.
Never run a pump dry. Most centrifugal pumps have a mechanical seal or stuffing box, therefore they cannot be run dry
under any working conditions, otherwise the sealing elements will be seriously damaged.
Before starting the pump, the suction pipe must be completely filled with the fluid to be pumped, this allows the pump to
start always primed and prevents the accumulation of air in the suction system. The procedure is as follows:
6.2
Pump Priming
6.3
Minimum Flow Rate
It must be taken into account that there is a minimum flow rate at which the pump must work, which is given by the
temperature of the pumped fluid, according to the following table.
0ºC < T < 50 ºC => 20% of the flow rate of the maximum efficiency point
50ºC < T < 80 ºC => 30% of the flow rate of the maximum efficiency point
6.4
Pumped Fluid Density
The power required for pump operation increases directly with the density of the pumped fluid. In order not to overload the
electric motor, it must be ensured that the pumped fluid corresponds to that which was originally considered for the
selection of the pump and its motor.
6.5
Checks on Electric Motor
When making the electrical connection, make sure that the type of current and rated voltage indicated on the motor
nameplate are in accordance with the type of current and voltage of the power supply at the place of installation.
Check the direction of rotation of the motor by running it for a moment. The direction of rotation must correspond to that
indicated by the arrow engraved on the pump body. If the direction of rotation is not correct, two phases must be inverted in
the terminal box of the motor (if it is a three-phase motor). Follow the indications described in the motor manual. The electric
board must be suitable for the type of motor drive, direct start, star-diagonal, soft starter, etc.
Verify that the degree of insulation and protection of the motor corresponds to the conditions in which it will operate.
!
CAUTION
NOT
E
Start-up
6.
1
Before Start-up
After a pump has been installed and all mechanical, hydraulic and electrical connections have been made, it is ready for
commissioning. However, prior to initial start-up, the following is recommended:
